OK starting from scratch.
I formated sd, tried to unmount ... failed
mount returned
sh-3.2# mount
mount
rootfs / rootfs ro,relatime 0 0
tmpfs /dev tmpfs rw,relatime,mode=755 0 0
devpts /dev/pts devpts rw,relatime,mode=600 0 0
proc /proc proc rw,relatime 0 0
sysfs /sys sysfs rw,relatime 0 0
tmpfs /mnt/asec tmpfs rw,relatime,mode=755,gid=1000 0 0
tmpfs /mnt/obb tmpfs rw,relatime,mode=755,gid=1000 0 0
/dev/block/mtdblock5 /system yaffs2 ro,relatime 0 0
/dev/block/mtdblock6 /data yaffs2 rw,noatime 0 0
/dev/block/mtdblock8 /persist yaffs2 rw,nosuid,nodev,relatime 0 0
/dev/block/mtdblock1 /cache yaffs2 rw,noatime 0 0
/dev/block/mtdblock1 /data/dalvik-cache yaffs2 rw,nosuid,nodev,relatime 0 0
/dev/block/vold/179:2 /data/sdext2 ext4 rw,relatime,barrier=1,data=ordered 0 0
none /sys/kernel/debug debugfs rw,relatime 0 0
/dev/block/vold/179:1 /mnt/sdcard vfat rw,dirsync,nosuid,nodev,noexec,relatime,u
id=1000,gid=1015,fmask=0702,dmask=0702,allow_utime=0020,codepage=cp437,iocharset
=iso8859-1,shortname=mixed,utf8,errors=remount-ro 0 0
/dev/block/vold/179:1 /mnt/secure/asec vfat rw,dirsync,nosuid,nodev,noexec,relat
ime,uid=1000,gid=1015,fmask=0702,dmask=0702,allow_utime=0020,codepage=cp437,ioch
arset=iso8859-1,shortname=mixed,utf8,errors=remount-ro 0 0
tmpfs /mnt/sdcard/.android_secure tmpfs ro,relatime,size=0k,mode=000 0 0
sh-3.2#
Any help?????